[Android][telemetry] Update pylib imports for modules that moved into devil.

build/android/pylib/perf/perf_control_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # pylint: disable=W0212
 
 import os
 import sys
 import unittest
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
 
-from pylib.device import device_utils
+from devil.android import device_utils
 from pylib.perf import perf_control
 
 class TestPerfControl(unittest.TestCase):
   def setUp(self):
     if not os.getenv('BUILDTYPE'):
       os.environ['BUILDTYPE'] = 'Debug'
 
     devices = device_utils.DeviceUtils.HealthyDevices(blacklist=None)
     self.assertGreater(len(devices), 0, 'No device attached!')
     self._device = devices[0]
 
   def testHighPerfMode(self):
     perf = perf_control.PerfControl(self._device)
     try:
       perf.SetPerfProfilingMode()
       cpu_info = perf.GetCpuInfo()
       self.assertEquals(len(perf._cpu_files), len(cpu_info))
       for _, online, governor in cpu_info:
         self.assertTrue(online)
         self.assertEquals('performance', governor)
     finally:
       perf.SetDefaultPerfMode()
 
 if __name__ == '__main__':
   unittest.main()